Save tools is possible ?

save tools of a player "StarterGear" is possible ? example: the player purchase a gun and he have the gun in his inventory and he leave the game, i want to know if it's possible if when he rejoin the place, the gun are alway in his inventory... "StarterGear"

It is possible, but not as simple as you think. Using a DataStore, you'd record the player purchasing the item, and saving it in the DataStore. Then, you'd check the DataStore every time a player joins the game, and see if they purchased a product, then load it in. It'll take some practice with DataStore.

You can use DataStores to save values.

http://wiki.roblox.com/index.php?title=Data_store

Just save a table of the player's items in his inventory whenever he leaves. Example:

local datastore = game:GetService("DataStoreService"):GetDataStore("Gear")

game.Players.PlayerAdded:connect(function(plr)
	local key = "user_" .. plr.UserId

	local items = datastore:GetAsync(key) or {}
end)

There is a basic setup for a datastore, hope I helped!